LEGAZPI CITY, Albay– The Philippine Institute of Volcanology and Seismology (Phivolcs) on Friday recorded a significant increase in sulfur dioxide (SO2) emissions at Mayon Volcano in Albay. In an advisory, Phivolcs said the volcanic SO2 flux on Thursday averaged 4,569 tonnes per day and increased to 7,475 tons per day on Friday, the highest emission